LOL. I must not have noticed that either.
Managed to get it to work, though.
If I remember correctly,
Take ownership of winhlp32.exe in windows folder and rename
Replace with the one in attached .zip
Accociate .hlp files with new winhlp32 in windows folder via Open With. winhlp32.zip
Worked for me on a previous build - not sure may have been 7100.
Then I found : Windows Help program (WinHlp32.exe) - Windows Live
Rt click and run as admin on the Install.cmd. I think I still needed to rename the winhlp.exe.mui in windows\en-us and rename winhlp in windows, then copy the new ones across.